Remove bad assert.

The original assert was meant to assert that the body renderer layout state is
not modified during the expansion of the iframe. This can falsely fire if the
body renderer already needed a layout before the iframe expansion.
diff --git a/WebCore/rendering/RenderPartObject.cpp b/WebCore/rendering/RenderPartObject.cpp
index 3867581..f864c00 100644
--- a/WebCore/rendering/RenderPartObject.cpp
+++ b/WebCore/rendering/RenderPartObject.cpp
@@ -386,9 +386,6 @@
                     ASSERT(!c->needsLayout());
                     c = c->nextInPreOrder();
                 }
-                Node* body = document()->body();
-                if (body)
-                    ASSERT(!body->renderer()->needsLayout());
 #endif
             }
         }